The simple present is used to convey the image of a present action.
Canto una canción. (I sing a song).
Ella lee una revista. (She reads a magazine).
Vivimos en la ciudad. (We live in the city).

The simple present is used to talk about something we usually do.
Normalmente me levanto a las siete. (I usually get up at seven).
Cada día paseamos por el parque. (Every day we walk through the park).
Siempre trabaja el domingo. (He always works on Sundays).

It is also used to talk about general facts that are known to be true.
El sol sale por el este. (The sun rises east).
La tierra gira alrededor del sol. (The earth rotates around the Sun).